Question: ) Complete the code to output the number 2 0 . function swap ( _ _ _ _ _ ) { $temp = $x; $x

) Complete the code to output the number 20.
function swap(_____){
$temp = $x;
$x = $y;
$y = $temp;
}
$a =10;
$b =20;
swap($a, $b);
echo $a;
a. x, y
b. $x, $y
c. &x, &y
d. &$x, &$y

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